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Blue screen flashes when turning TV or stereo on.
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JF Mezei
Jan 17, 2012, 3:40:15 PM1/17/12
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MacPro 2009.
I have 2 network cards
NVIDIA GeForce GT 120 : drives 2 desktop DVI NEC LCD displays.
ATI Radeon HD 5770: connected to a miniDVI to HDMI adaptor, connected
to a DENON amplified which is connected to a Sharp TV.
When I turn the DENON amp on, both the desktop screesn go blue for a
couple of seconds, often flashing one or twice. Then, same thing happens
when I turn on the TV. (the trick is to turn on the TV before the amp
so that the flashing happens once). Same thing happens when they are
being powered off.
Yet, when I turn on/off of the LCD desktop displays, there is no flashing.
When I turn off the TV or the amp, it re-arranges the desktop to put
stuff that was on the TV into the 2 remaining LCDs.
However, when I turn off either LCD, this doesn't happen, and there is
no "scree going blue" process.
Is there a way to avoid the screen going blue for a few seconds whenever
I turn the TV or amp on/off ?
(this also happens if the amp is told to get its source from a sony vcr
or from the TV itself, the Mac notices that it has lost connectivity to
the TV)
I have 2 network cards
NVIDIA GeForce GT 120 : drives 2 desktop DVI NEC LCD displays.
ATI Radeon HD 5770: connected to a miniDVI to HDMI adaptor, connected
to a DENON amplified which is connected to a Sharp TV.
When I turn the DENON amp on, both the desktop screesn go blue for a
couple of seconds, often flashing one or twice. Then, same thing happens
when I turn on the TV. (the trick is to turn on the TV before the amp
so that the flashing happens once). Same thing happens when they are
being powered off.
Yet, when I turn on/off of the LCD desktop displays, there is no flashing.
When I turn off the TV or the amp, it re-arranges the desktop to put
stuff that was on the TV into the 2 remaining LCDs.
However, when I turn off either LCD, this doesn't happen, and there is
no "scree going blue" process.
Is there a way to avoid the screen going blue for a few seconds whenever
I turn the TV or amp on/off ?
(this also happens if the amp is told to get its source from a sony vcr
or from the TV itself, the Mac notices that it has lost connectivity to
the TV)
David Spain
Jan 17, 2012, 11:18:14 PM1/17/12
to
You definitely have a space "shuttle" problem between two sets of screens
there so I guess that puts this on-topic?
My 'guess' on this is that when you power on your amp (which is actually
acting as a video mux) and/or your TV, the ATI card is sensing the available
resolution on the broadcast hardware and informing the video driver on the MAC
which in turn, makes the corresponding adjustment of video resolution which is
causing the glitch on your NVIDIA card in order to catch up to the new screen
resolution. If the resolution of the NVIDIA card was already set to the lower
res. that the TV hardware provides you'd notice this as a screen flash with no
other effects. If your NVIDIA card was set to a higher resolution, my guess is
that you'd see it switch to the lower res. to match the ATI card.
Short of ditching either the the ATI/TV setup or the NVIDIA dual-screen LCD
setup I don't see a workaround for this issue, short of just leaving the TV
hardware on and connected all the time.
BTW, this kind of thing happens all the time in the PC/laptop world when
attaching a projector to the video output of the laptop.
Dave
there so I guess that puts this on-topic?
My 'guess' on this is that when you power on your amp (which is actually
acting as a video mux) and/or your TV, the ATI card is sensing the available
resolution on the broadcast hardware and informing the video driver on the MAC
which in turn, makes the corresponding adjustment of video resolution which is
causing the glitch on your NVIDIA card in order to catch up to the new screen
resolution. If the resolution of the NVIDIA card was already set to the lower
res. that the TV hardware provides you'd notice this as a screen flash with no
other effects. If your NVIDIA card was set to a higher resolution, my guess is
that you'd see it switch to the lower res. to match the ATI card.
Short of ditching either the the ATI/TV setup or the NVIDIA dual-screen LCD
setup I don't see a workaround for this issue, short of just leaving the TV
hardware on and connected all the time.
BTW, this kind of thing happens all the time in the PC/laptop world when
attaching a projector to the video output of the laptop.
Dave
Brian Gaff
Jan 18, 2012, 2:58:26 AM1/18/12
to
Close your eyes?
Brian
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Brian Gaff - bri...@blueyonder.co.uk
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"JF Mezei" <jfmezei...@vaxination.ca> wrote in message
news:4f15dcb0$0$32222$c3e8da3$670b...@news.astraweb.com...
Brian
--
Brian Gaff - bri...@blueyonder.co.uk
Note:- In order to reduce spam, any email without 'Brian Gaff'
in the display name may be lost.
Blind user, so no pictures please!
"JF Mezei" <jfmezei...@vaxination.ca> wrote in message
news:4f15dcb0$0$32222$c3e8da3$670b...@news.astraweb.com...
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